Update. Finally I have this configuration:
CPU: Intel Core i5-6500 3.2GHz Quad-Core Processor ($198.88 @ OutletPC)
Motherboard: Gigabyte GA-B150M-D3H Micro ATX LGA1151 Motherboard ($87.49)
Memory: Kingston FURY 16GB (2 x 8GB) DDR4-2133 Memory ($73.67 @ NCIX US)
Storage: Samsung 250GB 2.5" Solid State Drive ($72.89 @ OutletPC)
Video Card: Asus GeForce GTX 750 Ti 2GB STRIX Video Card ($89.99 @ Newegg)
Total: $523 ($630 in my country)
Engine Version: 4.13
Graphics Card: GeForce GTX 750 Ti
Operating System: Windows 7
System Resolution During Test: 1920x1080
SCALABILITY SETTINGS
Resolution Scale: 100%
View Distance: Epic
Anti-Aliasing: Epic
Post Processing: Epic
Shadows: Epic
Textures: Epic
Effects: Epic
Editor Viewport FPS: 77
Play in Viewport FPS: 79
Not that bad, considering that my monitor can output only 60 FPS 